I have been casting my own designs but now I have an opportunity to
cast for a local store and I have no Idea what to charge.
My suggestion would be to contact some casters and check out their
prices. There's been lots of names floating around lately. Remember
that some charge less because they have high minimums... that should
be a factor.
I use a few different casters and their rates vary greatly...
Anywhere from 0.60 per gram (for tumble finish) to 2.00 a gram and up
for casting and polishing. Both have minimums (usually a flask).
Some charge only for the silver and then a flat rate for each piece
for labor (depending on polish/tumble, etc).